Way of collecting data online from user accessing a web site.
Form data automatically available to php scripts. Dots and spaces in variable names converted to underscores.
Form data can be made into an array using the following syntax <input name=”FormArray”> .
Group elements by assigning the same array name to different elements; can specify keys.
$_POST superglobal contains all POST data; paired with post method
$_GET superglobal contains all GET data and $_REQUEST is independent of data source, and merges information from sources like GET, POST, and COOKIES; usage is not recommended